I have found the Motorola 85 degree C gold oven to be quite
stable - the earlier black 65 degree C oven wasn't.
I think I found a brand new gold one in stock here a few weeks
ago too.
Neil
---- Original Message ----
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] midland 13-509 tx freq stability...
capchange?
Date: Tue, 23 May 2006 17:00:21 -0700
>At 5/23/2006 02:06 PM, you wrote:
>>If you decide to use an 85 deg C oven, you must get the crystal cut
>for
>>that temperature.
>
>Yes, I've noticed some short-term aging problems with crystals run at
>50
>C. In one case the crystal was held at 35 C for a couple of years,
>then
>sat on the shelf for a few more. When put back into service at 50 C,
>it
>drifted up about 2 PPM over a period of a couple of days.
>
>So it seems that even moderately heated crystals need to be aged at
>their
>operating temperature.
>
>Bob NO6B
>
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>Yahoo! Groups Links
>
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>
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